Electrode sheet and producing method thereof, and related device

Abstract

An electrode sheet includes a current collector as well as an insulating layer and an active material layer arranged on the current collector along a first direction, the insulating layer is first formed on the current collector, and then the active material layer is formed on the current collector, so that an edge portion on one side of the active material layer close to the insulating layer covers a first edge region of the insulating layer.

What is claimed is: 
     
         1 . An electrode sheet, comprising:
 a current collector; and   an insulating layer and an active material layer located on the current collector;   wherein the active material layer and the insulating layer are arranged along a first direction of the current collector, and an edge portion on one side of the active material layer close to the insulating layer covers a first edge region of the insulating layer.   
     
     
         2 . The electrode sheet according to  claim 1 , wherein in the first direction, a tab of the current collector is located on one side of the insulating layer away from the active material layer. 
     
     
         3 . The electrode sheet according to  claim 2 , wherein a second edge region of the insulating layer covers an end region on one side of the tab close to the active material layer. 
     
     
         4 . The electrode sheet according to  claim 1 , wherein a thickness of the insulating layer ranges from 1 μm to 25 μm. 
     
     
         5 . The electrode sheet according to  claim 4 , wherein the thickness of the insulating layer ranges from 2 μm to 10 μm. 
     
     
         6 . The electrode sheet according to  claim 1 , wherein in the first direction, a size of the edge portion ranges from 0 to 5 mm. 
     
     
         7 . The electrode sheet according to  claim 1 , further comprising:
 a conductive layer;   wherein the conductive layer is located between the current collector and the active material layer, and the active material layer completely covers the conductive layer.   
     
     
         8 . The electrode sheet according to  claim 7 , wherein in the first direction, a gap is provided between the conductive layer and the insulating layer. 
     
     
         9 . The electrode sheet according to  claim 8 , wherein in the first direction, a size of the gap ranges from 0.1 mm to 4 mm. 
     
     
         10 . The electrode sheet according to  claim 9 , wherein in the first direction, the size of the gap ranges from 0.5 mm to 1 mm. 
     
     
         11 . The electrode sheet according to  claim 7 , wherein a thickness of the conductive layer ranges from 0.5 μm to 2 μm. 
     
     
         12 . The electrode sheet according to  claim 1 , wherein the insulating layer and the active material layer are sequentially formed on the current collector by coating and drying. 
     
     
         13 . The electrode sheet according to  claim 1 , wherein the insulating layer is formed on the current collector by coating and drying using a micro-gravure coating process. 
     
     
         14 . A producing method of an electrode sheet, the method comprising:
 coating an insulating layer slurry on a current collector to form an insulating layer after drying; and   coating an active material layer slurry on the current collector to form an active material layer after drying, so as to obtain the electrode sheet;   wherein the active material layer and the insulating layer are arranged along a first direction of the current collector, and an edge portion on one side of the active material layer close to the insulating layer covers a first edge region of the insulating layer.   
     
     
         15 . The producing method according to  claim 14 , further comprising:
 processing, in the first direction, the current collector located on one side of the insulating layer away from the active material layer to form a tab.   
     
     
         16 . The producing method according to  claim 15 , wherein a second edge region of the insulating layer covers an end region on one side of the tab close to the active material layer. 
     
     
         17 . The producing method according to  claim 14 , wherein a thickness of the insulating layer ranges from 1 μm to 25 μm. 
     
     
         18 . The producing method according to  claim 17 , wherein the thickness of the insulating layer ranges from 2 μm to 10 μm. 
     
     
         19 . The producing method according to  claim 14 , wherein in the first direction, a size of the edge portion ranges from 0 to 5 mm. 
     
     
         20 . The producing method according to  claim 14 , further comprising, before coating the active material layer slurry on the current collector:
 coating a conductive layer slurry on the current collector to form a conductive layer after drying;   wherein the active material layer completely covers the conductive layer.